now, president obama hoped to meet one last time with nelson mandela in june when he traveled to south africa. i was on that trip. mandela was in no condition to meet with the president. but he did visit robben island. and there, you see him in the tiny cell that nelson mandela spent 17 years of his years in imprisonment. i can tell you, george, that was quite a trip to africa for the first african-american president. but without question, the emotional highlight of that trip was when he stepped into that cell on robben island. >> and nelson mandela, barack obama, something in common. they're both the first black presidents of their countries. but president obama would bristle at comparisons. >> reporter: it was interesting. on that africa trip, president obama compared mandela to somebody else, to george washington, as the founder of south africa. and also in the sense that mandela stepped down from power voluntarily, just as george washington stepped down after two terms. mandela stepped down after only one. >> an important example to set. jon karl, thanks very much. >>> let's go to